A tug-of-war is a sports event in which two teams test their strength by pulling against each other on opposite ends of a rope.
The sailors won at tug of war.
You can use tug-of-war to refer to a situation in which two people or groups both want the same thing and are fairly equally matched in their struggle to get it.
tug of war 也可以用来指两组或两个人针锋相对又实力相当，很难决出胜负的情况。
When Greek meets Greek,then comes the tug of war.”